Ramsey ElectronicsメーカーSHA1の使用説明書/サービス説明書
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SHA1 • 1 STEREO HEADPHONE AMPLIFIER Ramsey Electronics Model No. SHA1 Need a way to listen to line leve l audio from a tape deck or CD player? Need a way of boosting up any lo w level signal to earp.
SHA1 • 2 RA M SEY TRA NSMIT TER KIT S • FM100B Professional FM Stereo Transmitter • FM25B S ynthesized Stereo FM Transmi tter • MR6 Model Rocket Track ing Transmitter • TV6 Television Tr ans.
SHA1 • 3 STEREO HEADPHONE AMPLIFIER KIT Ramsey Publication No . MSHA1 Price $5.00 How does it work . ............ ....... 4 Assembly Strategy ................. 6 Parts List ........... .............. ....... 7 Parts Layout Diagram ............ 8 Part Values Diagram .
SHA1 • 4 What is it and how does it w ork? Let’s take a look at the schematic diagram, and we will follow through from input to output to get a general idea how this kit works, and why. W e will look onl y at the left channel circuitry starting at J1 since the right channel is ide ntical to the left.
SHA1 • 5 C3 is another coupl in g capacitor, and it serves the same purpose as C1 at the start of the circuit. This prevents the DC portion of the signal on the output of U1 fr om being sent to the earphones. VR1, C15 and C16 supply the regulated DC voltage for the circuit.
SHA1 • 6 RAMSEY “LEARN-AS-YOU-BUILD” ASSEM BLY STRATEGY Be sure to read through all of t he steps, and check the bo xes as you go to be sure you didn't mi ss any important steps. Althoug h you may be in a hurry to see re sults, before you switch on the power check all wiring and capacito rs for proper or ientation.
SHA1 • 7 SHA1 PARTS LIST Semiconductors 2 LM386 Audio Amplifier ICs (U1,2) 1 1N4002 rectifier diode (Bla ck body with white stripe on one end) (D1) 1 7808 Voltage Regulator (U3) Resistors 2 4.
SHA1 • 8 PARTS LAYOUT DI A GR AM.
SHA1 • 9 PA RT S VA LUE DIA GRA M.
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SHA1 • 12 AS S EM B L I NG T H E SH A1 H E AD P HO N E AMP L IF I E R S: Sort out all of your parts to begi n with, making sure you have all of the parts required.
SHA1 • 13 11. Install U2, one of the LM38 6 audio po wer amplifier ICs. Check the orientation of this ch ip to make sure the dot o r notch representing pin one is in the same direction as shown in the parts diagram. Make su re all eight pi ns are through the board before soldering.
SHA1 • 14 usually indicating the negative (-) terminal of the component. You will notice on the parts layout diagram that the hole for the positive terminal is denoted, not the negative one. You will want to install this component wi th the positive (+) lead in the same orientation as shown in th e parts layout diagram.
SHA1 • 15 35. Install C16, 10uF electrolytic capacitor. W atch polarity! 36. Install U3, the 7808 voltage regulator. You will want to bend the center lead out and orient the pa rt so that the writing on the front of the part faces the ou tside of the board.
SHA1 • 16 TESTING THE SHA1 You will need the following equipment for this test. Audio source such as signa l generator, C D player, or tape deck. RCA jacks to feed audio to the SHA1 Good quality headphones. A 9 volt battery or DC power supply Simply connect your SHA1 up as if you were going to use it.
SHA1 • 17 TROUBLESHOOTING TIPS PROBLEM: No sound out of any c hannel. SOLUTION: Use a DMM to check the power supply voltage, do you have a fresh batt ery? If everything is OK, check your assembly, especially your parts orientation (D1?). Also check your earphones for proper operati on as well as your sound source.
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SHA1 • 19 The Ramsey K it Warranty Ple ase r ead ca refully BEFO RE callin g or wr iting i n abou t y our kit. Most pr oblem s can be solv ed without contac ting the fac tory. Notice that thi s is not a "fine prin t " warranty . We want you to u nderstan d your righ ts and ours too ! All Ramsey kits will work if assembl ed properly.
SHA1 • 20 SHA1 STEREO HEADPHONE AMPLIFIER KIT Quick Reference Page Guide How does it work .......... ................. ... 4 Assembly Strategy .................. .......... 6 Parts L ist .................... ................. ...... 7 Parts Layout Diagram .
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Ramsey Electronics SHA1をまだ購入していないなら、この製品の基本情報を理解する良い機会です。まずは上にある説明書の最初のページをご覧ください。そこにはRamsey Electronics SHA1の技術情報の概要が記載されているはずです。デバイスがあなたのニーズを満たすかどうかは、ここで確認しましょう。Ramsey Electronics SHA1の取扱説明書の次のページをよく読むことにより、製品の全機能やその取り扱いに関する情報を知ることができます。Ramsey Electronics SHA1で得られた情報は、きっとあなたの購入の決断を手助けしてくれることでしょう。
Ramsey Electronics SHA1を既にお持ちだが、まだ読んでいない場合は、上記の理由によりそれを行うべきです。そうすることにより機能を適切に使用しているか、又はRamsey Electronics SHA1の不適切な取り扱いによりその寿命を短くする危険を犯していないかどうかを知ることができます。
ですが、ユーザガイドが果たす重要な役割の一つは、Ramsey Electronics SHA1に関する問題の解決を支援することです。そこにはほとんどの場合、トラブルシューティング、すなわちRamsey Electronics SHA1デバイスで最もよく起こりうる故障・不良とそれらの対処法についてのアドバイスを見つけることができるはずです。たとえ問題を解決できなかった場合でも、説明書にはカスタマー・サービスセンター又は最寄りのサービスセンターへの問い合わせ先等、次の対処法についての指示があるはずです。
